DEWALT DW1220 5/16-Inch Cobalt Split Point Twist Drill Bit The product is 5/16" Cobalt, Split Point Drill Bit, Industrial Grade Cobalt Steel, For Drilling In Stainless Steel/Abrasive Metal? Other Hard To Drill Alloys Applications. Easy to use The product is manufactured in China Maximum speed and life in stainless steel and other hard metals Pilot pt tip desgin starts on contact and eliminates bit walking Industrial strength cobalt for optimum life and durability in metal